Posted by: Cliff.Gordon ® 05/09/2006, 18:16:52 Author Profile eMail author Edit

I am looking for a 4 point lift on a beam and the resultant deflection formula. I have end supported, two point mid supported, but I can't find four point supports. Can someone help me with this formula? Thanks, Cliff

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Re: 4 point beam deflection
Re: 4 point beam deflection -- Cliff.Gordon	Post Reply	Top of thread	Forum

Posted by: Scooter ® 05/10/2006, 12:12:42 Author Profile eMail author Edit

For these supports, I assume they divide into 3 equal spans, all loaded equally. If so you might try: Support A.= Ra=0.400 wl (left end reaction) Rb=1.100 wl (left one third reaction) Rc=1.100 wl (right one third reaction) Rd=0.400 wl (right end reaction) This is on page 2.132 of AISC's 6th edition Manual. Hope it works for you. Thanks, Scooter

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Re: Re: 4 point beam deflection
Re: Re: 4 point beam deflection -- Scooter	Post Reply	Top of thread	Forum

Posted by: Scooter ® 05/10/2006, 13:20:25 Author Profile eMail author Edit

Follow up to my last: You wanted info. on Defelection. Here is what AISC has on it. Def.Max= (0.446l from A or d)=1.0069 wl(4)/EI Thanks, Scooter

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Re: Re: Re: 4 point beam deflection
Re: Re: Re: 4 point beam deflection -- Scooter	Post Reply	Top of thread	Forum

Posted by: Cliff.Gordon ® 05/10/2006, 16:00:03 Author Profile eMail author Edit

Thanks Scooter, I'll give that a whirl! Actually, my beam supports are L/8 from ends and then two more equally spaced between those. I am looking for a formula similar to 5wL^4/384EI for a simple supported beam. Any help would be great. Thanks, Cliff

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Re: Re: Re: Re: 4 point beam deflection
Re: Re: Re: Re: 4 point beam deflection -- Cliff.Gordon	Post Reply	Top of thread	Forum

Posted by: Scooter ® 05/11/2006, 09:37:32 Author Profile eMail author Edit

Sorry Cliff, I can't find any in my books with multi-supports where the first & last are NOT at the ends. Scooter

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